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FOSSILS. { Between the Rock }
Precambrian
Quaternary
Neogene
Paleogene
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
million years ago (mya)
Cenozoic Era
Quaternary

0 to 2.58 mya
Neogene

2.58 to 23.03 mya
Paleogene

23.03 to 66 mya
Mesozoic Era
Cretaceous

66 to 145 mya
Jurassic

145 to 201.3 mya
Triassic

201.3 to 251.902 mya
Paleozoic Era
Permian

251.902 to 298.9 mya
Carboniferous

298.9 to 358.9 mya
Devonian

358.9 to 419.2 mya
Silurian

419.2 to 443.8 mya
Ordovician

443.8 to 485.4 mya
Cambrian

485.4 to 541 mya
Precambrian Era

541 mya to 4.6 billion years ago